Each of the following sentences has an error. Find the errors and correct them.
46. A dog should be checked regular by a reterinarian to ensure that it remains in good health.
47. George has not completed the assignment yet , and Mary hasn’t neither.
48. Although my sister was tired, but she helped me with my homework.
49. Sinaitic is the name of an alphabet which developed their symbols from Egyptian hieroglyphics.
50. There are many different ways of comparing the economy of one nation with those of another.
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